small refactor to make it testable.

src/state/CallViewModel/remoteMembers/integration.test.ts

@@ -22,6 +22,7 @@ import { ECConnectionFactory } from "./ConnectionFactory.ts";
 import { type OpenIDClientParts } from "../../../livekit/openIDSFU.ts";
 import {
   mockCallMembership,
+  mockComputeLivekitParticipantIdentity$,
   mockMediaDevices,
   withTestScheduler,
 } from "../../../utils/test.ts";
@@ -43,6 +44,11 @@ let lkRoomFactory: () => LivekitRoom;
 
 const createdMockLivekitRooms: Map<string, LivekitRoom> = new Map();
 
+vi.mock(import("./LivekitParticipantIdentity.ts"), async (importOriginal) => ({
+  ...(await importOriginal()),
+  computeLivekitParticipantIdentity$: mockComputeLivekitParticipantIdentity$,
+}));
+
 beforeEach(() => {
   testScope = new ObservableScope();
   mockClient = {